Worksheet 88 · Skill 3

Dead reckoning

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1. At 0740 you fix your position 230°T, 2.4 nm from Tern Island tower. You steer 111°T at 5.0 kn until 0750, then 199°T at 4.9 kn until 0800.

   Give the 0800 DR position as the true bearing FROM Tern Island tower to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Tern Island tower: ________ °T   Distance: ________ nm  

2. At 0810 you fix your position 036°T, 3.6 nm from Heron Point Light. You steer 164°T at 6.3 kn until 0835, then 334°T at 7.9 kn until 0900.

   Give the 0900 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

3. At 1145 you fix your position 043°T, 3.5 nm from Heron Point Light. You steer 332°T at 5.6 kn until 1215, then 198°T at 5.3 kn until 1240.

   Give the 1240 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

4. At 0800 you fix your position 003°T, 1.4 nm from Gannet Rock daybeacon. You steer 162°T at 5.9 kn until 0830, then 019°T at 8.8 kn until 0840.

   Give the 0840 DR position as the true bearing FROM Gannet Rock daybeacon to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Gannet Rock daybeacon: ________ °T   Distance: ________ nm  

5. At 1245 you fix your position 267°T, 1.6 nm from Gannet Rock daybeacon. You steer 286°T at 9.8 kn until 1255, then 230°T at 8.0 kn until 1305.

   Give the 1305 DR position as the true bearing FROM Mill stack to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Mill stack: ________ °T   Distance: ________ nm  

6. At 1535 you fix your position 097°T, 3.0 nm from Westfield church spire. You steer 183°T at 5.7 kn until 1555, then 332°T at 5.3 kn until 1640.

   Give the 1640 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm  

7. At 1000 you fix your position 260°T, 1.6 nm from Gannet Rock daybeacon. You steer 256°T at 7.6 kn until 1030, then 301°T at 4.2 kn until 1040.

   Give the 1040 DR position as the true bearing FROM Heron Point Light to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Heron Point Light: ________ °T   Distance: ________ nm  

8. At 1005 you fix your position 234°T, 2.9 nm from Tern Island tower. You steer 301°T at 6.4 kn until 1030, then 266°T at 5.5 kn until 1045.

   Give the 1045 DR position as the true bearing FROM Westfield church spire to the DR, and the distance. Courses are true and speeds are through the water; dead reckoning ignores current and leeway.

   Tolerance: 2° and 0.15 nm (or 4 % of the distance).

   Bearing from Westfield church spire: ________ °T   Distance: ________ nm